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Conveying System Mechanical Components    Chapter 3: Installation 
46 of 138 
  Use piping or ducting at least two (2) diameter sizes larger than the vacuum 
connection. Overall vent pipe length—horizontal plus vertical—should not exceed 100 
feet (about 30 m) and should not include more than three (3) elbows. If you use pipe 
for venting, make sure that you use Sch. 5 or Sch. 10 pipe with long radius elbows to 
provide minimum airflow resistance. If you use ducting, make sure you use high-
pressure ducting with mitered bends—with a minimum of three (3) breaks—for 
minimum airflow resistance. Make sure all piping connections are properly supported. 
  If you are venting pump discharge outdoors, make sure you properly terminate vent 
piping to prevent pump damage. You can either: 
a.  Install a rain cap, or  
b.  Install the piping so the exhaust faces down and terminates with a screened 
opening. 
Note:  If the pump becomes contaminated from rain or airborne particulates, or is 
damaged by birds, insects, or small animals, your warranty becomes void!      
Any variance from these guidelines can cause excessive pump backpressure. 
Such a condition can drastically affect equipment performance, possibly 
leading to equipment damage
.